[jira] [Commented] (ZOOKEEPER-2476) Not possible to upgrade via reconfig a Participant+Observer cluster to a Participant+Participant cluster

["Alexander Shraer (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15380363#comment-15380363 ] 

Alexander Shraer commented on ZOOKEEPER-2476:
---------------------------------------------

Jordan, if I understand your description correctly, it seems like its working as intended. See https://zookeeper.apache.org/doc/trunk/zookeeperReconfig.html#sc_reconfig_errors
especially the last part "Changing an observer into a follower".

> Not possible to upgrade via reconfig a Participant+Observer cluster to a Participant+Participant cluster
> --------------------------------------------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-2476
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2476
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: quorum, server
>    Affects Versions: 3.5.1
>            Reporter: Jordan Zimmerman
>            Assignee: Alexander Shraer
>            Priority: Critical
>         Attachments: ZOOKEEPER-2476.patch
>
>
> Contrary to the documentation, it is not possible to upgrade via reconfig a Participant+Observer cluster to a Participant+Participant cluster. KeeperException.NewConfigNoQuorum is thrown instead.
> PrepRequestProcessor should recognize this special case and let it pass. Test will be enclosed shortly. I'll work on a fix as well, but I imagine that [~shralex] will want to look at it.



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